Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a191b20f5fcbed…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 10:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f22512d37f85b79497ff3a5ffcc2febe SHA-1: 80923fac840fd4716ad283647d2edde12cfc7364 SHA-256: 33a191b20f5fcbed0d5e6a0536b7eb6d421255786ff66e47cb8e14ec2467ade8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document instructs the user to copy and paste commands into a shell, likely to download and execute a secondary payload. Several unknown URLs were extracted, which could serve as sources for such payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hurtglass.pl/upload/file/51237195516.pdf In PDF document text
    • http://samurairamenbar.com/uploads/files/25953873354.pdfIn PDF document text
    • http://skncn.com/u/files/wovabamanakoxotujerul.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff29a19d60---nunusiranosibefavaxeviwow.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/56439836014.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/xugazi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/mipidajefomofifeb.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/19935762342.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/91817609483.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/judaduzebex.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/buxodezewav.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sigilujul.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/15449464407.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/99767368845.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161304690dcfa0---baniwivu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/xesin.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/7639524986.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/tazotemojimawojaw.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/84558979741.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/21403125380.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/wonibegoxitirawejoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mac+startup+progress+bar+stuckPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/56786812278.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 17756 bytes
SHA-256: fd23c35ce5bdb2e9d67e5fff05625b96cf61ba3581903406cb5022c01e7a7547
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 10632 bytes
SHA-256: 107fab9396db2ab9769337a26e1b19b4c1f1105054ab7a95544e5ba2b852545e

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